Answer :
Here are the answers to the given statements:
1. All chromatographic columns can be chemically modified - TrueChromatography columns can be modified chemically to make them more specific and selective for the separation of compounds. The purpose of modifying the column is to modify its surface chemistry to interact differently with different types of solutes. So the given statement is true.
2. In the gas chromatography technique, the sample does not have any interaction with the mobile phase - FalseIn gas chromatography, the sample interacts with the mobile phase, which is a carrier gas, while moving through the column. The column itself is stationary and packed with a stationary phase which interacts with the sample. So the given statement is false.
3. In chromatographic techniques, detectors add selectivity to the system - TrueIn chromatographic techniques, detectors are used to measure the concentration of a solute. Different detectors respond differently to different types of solutes, so they add selectivity to the system. So the given statement is true.4. In chromatographic techniques, they do not need a calibration curve to make the determinations - FalseChromatographic techniques require a calibration curve to determine the concentration of a solute. The calibration curve is generated by analyzing samples with known concentrations of the solute and plotting the detector response against the concentration of the solute. So the given statement is false.
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